Ordovician-Devonian granites and Li-Be-bearing pegmatites in the Altyn Tagh Orogen, NW China
文献类型：期刊论文
| 作者 | Jing, Yan7; Zhang, Chuan-lin7; Wang, Chen6; Ge, Wen-chun5; Song, Zhi-hao7; Ye, Xian-tao7; Quan, Yi-kang4; Xu, Zhi-kai3; Che, Hai-long2; Wang, Yong2 |
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2025-04-24 |
| 页码 | 21 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B38002.1 |
| 通讯作者 | Zhang, Chuan-lin(zhangchuanlin@hhu.edu.cn) |
| 英文摘要 | The Altyn Tagh Orogen in NW China contains a recently discovered rare-metal ore field with great Li-Be metallogenic potential, genetically related to voluminous granites and pegmatites. The accurate formation ages, genetic relationships between rare-metal pegmatites and coeval granite, the Li-Be enrichment mechanism, and the coupling relation between rare-metal mineralization and the tectonic evolution of the Proto-Tethys Ocean remain poorly constrained. To address these disputes, we carried out field investigations, laser ablation-multi-collector-inductively coupled plasma-mass spectrometry dating of zircon, monazite, and cassiterite, in situ zircon Hf isotopic analyses, and whole-rock major element, trace element, and Sr-Nd isotopic analyses of Paleozoic granite and Li-rich and Li-poor pegmatites in the Altyn Tagh Orogen, including samples from the Ayage, Southern Washixia, and Huanglongling Li-Be deposits. Zircon, monazite, and cassiterite U-Pb dating shows that these granites and pegmatites were emplaced at 466-397.7 Ma. The biotite granodiorites (444.5-434.4 Ma) have adakite-like features, including high Sr and Ba contents, low contents of heavy rare earth elements (REEs), Yb, and Y, and high Sr/Y and (La/Yb)(N) ratios. Their high K2O contents and low MgO, Cr, and Ni contents suggest they were formed through partial melting of thickened lower crust under conditions of the garnet amphibolite facies. The muscovite-garnet monzogranites and Li-Be-bearing pegmatites are peraluminous, characterized by relatively high Al2O3 contents and A/CNK [molar ratio Al2O3/(CaO + Na2O + K2O)] values, and contain muscovite, tourmaline, and corundum, indicating their S-type signatures. These Li-Be pegmatites have similar REE patterns but distinctly lower REEs contents than the coeval S-type granites. The granitic pegmatites related to Li-Be mineralization have extremely low Nb/Ta and Zr/Hf ratios, indicating that their parental magma was not derived directly through low-degree partial melting of a meta-sedimentary source, but more likely originated through extreme fractional crystallization of coeval or earlier S-type granites. All the granites and pegmatites yielded heterogeneous Sr-Nd-Hf isotopic compositions with predominately negative epsilon(Nd)(t) and epsilon(Hf)(t) values, indicating mixed sources consisting mainly of recycled ancient lower crustal material with minor juvenile crustal components. Integrating the regional magmatic evolution of the Altyn Tagh Orogen with our data, we conclude that post-collisional extension triggered intense decompression melting at a range of crustal depths, which gave rise to granitic melts that underwent high degrees of crystal fractionation, ultimately generating Li-Be-rich melts and resulting in the formation of Li-Be deposits. The multi-staged petrogenesis and rare-metal mineralization (466-397.7 Ma) were related to the evolution of the Central Altyn Ocean and North Altyn Ocean. |
| WOS关键词 | U-PB AGE ; LITHIUM-BERYLLIUM DEPOSIT ; HF ISOTOPIC COMPOSITIONS ; RARE-METAL PEGMATITES ; A-TYPE GRANITOIDS ; NORTH ALTUN ; SOUTH ALTYN ; CONTINENTAL-CRUST ; INTRUSIVE ROCKS ; ZIRCON |
| 资助项目 | National Key Research and Development Program of China[2021YFC2901904] ; Natural Sci-ence Foundation of Jiangsu Province of China[BK20241538] ; China Postdoctoral Science Foun-dation[2024M750726] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001477653000001 |
| 出版者 | GEOLOGICAL SOC AMER, INC |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/201742]  |
| 专题 | 海洋研究所_深海极端环境与生命过程研究中心 |
| 通讯作者 | Zhang, Chuan-lin |
| 作者单位 | 1.Sichuan Xiwei Geol Explorat Co LTD, Chengdu 610000, Peoples R China 2.Jilin Prov Fourth Geol Survey Inst, Tonghua 134001, Peoples R China 3.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 4.Univ Sci & Technol China, Sch Earth & Space Sci, State Key Lab Lithospher & Environm Coevolut, Hefei 230026, Peoples R China 5.Jilin Univ, Coll Earth Sci, Changchun 130061, Peoples R China 6.China Geol Survey, Nanjing Ctr, Nanjing 210016, Peoples R China 7.Hohai Univ, Coll Oceanog, Nanjing 211100, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jing, Yan,Zhang, Chuan-lin,Wang, Chen,et al. Ordovician-Devonian granites and Li-Be-bearing pegmatites in the Altyn Tagh Orogen, NW China[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2025:21. |
| APA | Jing, Yan.,Zhang, Chuan-lin.,Wang, Chen.,Ge, Wen-chun.,Song, Zhi-hao.,...&Zhou, Jun-wang.(2025).Ordovician-Devonian granites and Li-Be-bearing pegmatites in the Altyn Tagh Orogen, NW China.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,21. |
| MLA | Jing, Yan,et al."Ordovician-Devonian granites and Li-Be-bearing pegmatites in the Altyn Tagh Orogen, NW China".GEOLOGICAL SOCIETY OF AMERICA BULLETIN (2025):21. |
入库方式： OAI收割
来源：海洋研究所
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